Security watchers say the Kama Sutra worm, which is programmed to overwrite files on infected Windows PCs today, will have a damaging but not catastrophic effect. The Kama Sutra worm (or Nyxem-E or Blackworm) poses as an email message offering a variety of salacious content. Subject lines used in the malicious emails include: The Best Videoclip Ever, Fw: SeX.mpg, Miss Lebanon 2006 and Fuckin Kama Sutra pics. The worm, which can also spread across network shares, only affects Windows PCs.